var loadingImage = 'http://';		
var closeButton = 'http://';		
function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ 
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { 
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { 
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { 
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}


	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

function pause(numberMillis) {
	var now = new Date();
	var exitTime = now.getTime() + numberMillis;
	while (true) {
		now = new Date();
		if (now.getTime() > exitTime)
			return;
	}
}
function getKey(e){
	if (e == null) { // ie
		keycode = event.keyCode;
	} else { // mozilla
		keycode = e.which;
	}
	key = String.fromCharCode(keycode).toLowerCase();
	
	if(key == 'x'){ hideUpbox(); }
}

function listenKey () {	document.onkeypress = getKey; }
function showUpbox(objLink)
{
	var objOverlay = document.getElementById('overlay');
	var objUpbox = document.getElementById('upbox');
	var objCaption = document.getElementById('upboxCaption');
	var objImage = document.getElementById('upboxImage');
	var objLoadingImage = document.getElementById('loadingImage');
	var objUpboxDetails = document.getElementById('upboxDetails');

	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	if (objLoadingImage) {
		objLoadingImage.style.top = (arrayPageScroll[1] + ((arrayPageSize[3] - 35 - objLoadingImage.height) / 2) + 'px');
		objLoadingImage.style.left = (((arrayPageSize[0] - 20 - objLoadingImage.width) / 2) + 'px');
		objLoadingImage.style.display = 'block';
	}

	objOverlay.style.height = (arrayPageSize[1] + 'px');
	objOverlay.style.display = 'block';

	imgPreload = new Image();

	imgPreload.onload=function(){
		objImage.src = objLink.href;
		var upboxTop = arrayPageScroll[1] + ((arrayPageSize[3] - 35 - imgPreload.height) / 2);
		var upboxLeft = ((arrayPageSize[0] - 20 - imgPreload.width) / 2);
		
		objUpbox.style.top = (upboxTop < 0) ? "0px" : upboxTop + "px";
		objUpbox.style.left = (upboxLeft < 0) ? "0px" : upboxLeft + "px";


		objUpboxDetails.style.width = imgPreload.width + 'px';
		
		if(objLink.getAttribute('title')){
			objCaption.style.display = 'block';
			objCaption.innerHTML = objLink.getAttribute('title');
		} else {
			objCaption.style.display = 'none';
		}
		
		if (navigator.appVersion.indexOf("MSIE")!=-1){
			pause(250);
		} 

		if (objLoadingImage) {	objLoadingImage.style.display = 'none'; }

		selects = document.getElementsByTagName("select");
        for (i = 0; i != selects.length; i++) {
                selects[i].style.visibility = "hidden";
        }

	
		objUpbox.style.display = 'block';

		arrayPageSize = getPageSize();
		objOverlay.style.height = (arrayPageSize[1] + 'px');
		listenKey();

		return false;
	}

	imgPreload.src = objLink.href;
	
}

function hideUpbox()
{
	objOverlay = document.getElementById('overlay');
	objUpbox = document.getElementById('upbox');

	objOverlay.style.display = 'none';
	objUpbox.style.display = 'none';

	selects = document.getElementsByTagName("select");
    for (i = 0; i != selects.length; i++) {
		selects[i].style.visibility = "visible";
	}

	document.onkeypress = '';
}

function initUpbox()
{
	
	if (!document.getElementsByTagName){ return; }
	var anchors = document.getElementsByTagName("a");
	for (var i=0; i<anchors.length; i++){
		var anchor = anchors[i];

		if (anchor.getAttribute("href") && (anchor.getAttribute("rel") == "upbox")){
			anchor.onclick = function () {showUpbox(this); return false;}
		}
	}

	var objBody = document.getElementsByTagName("body").item(0);
	
	var objOverlay = document.createElement("div");
	objOverlay.setAttribute('id','overlay');
	objOverlay.onclick = function () {hideUpbox(); return false;}
	objOverlay.style.display = 'none';
	objOverlay.style.position = 'absolute';
	objOverlay.style.top = '0';
	objOverlay.style.left = '0';
	objOverlay.style.zIndex = '90';
 	objOverlay.style.width = '100%';
	objBody.insertBefore(objOverlay, objBody.firstChild);
	
	var arrayPageSize = getPageSize();
	var arrayPageScroll = getPageScroll();

	var imgPreloader = new Image();
	
	imgPreloader.onload=function(){

		var objLoadingImageLink = document.createElement("a");
		objLoadingImageLink.setAttribute('href','#');
		objLoadingImageLink.onclick = function () {hideUpbox(); return false;}
		objOverlay.appendChild(objLoadingImageLink);
		
		var objLoadingImage = document.createElement("img");
		objLoadingImage.src = loadingImage;
		objLoadingImage.setAttribute('id','loadingImage');
		objLoadingImage.style.position = 'absolute';
		objLoadingImage.style.zIndex = '150';
		objLoadingImageLink.appendChild(objLoadingImage);

		imgPreloader.onload=function(){};

		return false;
	}

	imgPreloader.src = loadingImage;
	var objUpbox = document.createElement("div");
	objUpbox.setAttribute('id','upbox');
	objUpbox.style.display = 'none';
	objUpbox.style.position = 'absolute';
	objUpbox.style.zIndex = '100';	
	objBody.insertBefore(objUpbox, objOverlay.nextSibling);
	var objLink = document.createElement("a");
	objLink.setAttribute('href','#');
	objLink.setAttribute('title','Kliknij aby zamknąć');
	objLink.onclick = function () {hideUpbox(); return false;}
	objUpbox.appendChild(objLink);
	var imgPreloadCloseButton = new Image();
	imgPreloadCloseButton.onload=function(){
		var objCloseButton = document.createElement("img");
		objCloseButton.src = closeButton;
		objCloseButton.setAttribute('id','closeButton');
		objCloseButton.style.position = 'absolute';
		objCloseButton.style.zIndex = '200';
		objLink.appendChild(objCloseButton);

		return false;
	}

	imgPreloadCloseButton.src = closeButton;
	var objImage = document.createElement("img");
	objImage.setAttribute('id','upboxImage');
	objLink.appendChild(objImage);
	var objUpboxDetails = document.createElement("div");
	objUpboxDetails.setAttribute('id','upboxDetails');
	objUpbox.appendChild(objUpboxDetails);
	var objCaption = document.createElement("div");
	objCaption.setAttribute('id','upboxCaption');
	objCaption.style.display = 'none';
	objUpboxDetails.appendChild(objCaption);
}
function addLoadEvent(func)
{	
	var oldonload = window.onload;
	if (typeof window.onload != 'function'){
    	window.onload = func;
	} else {
		window.onload = function(){
		oldonload();
		func();
		}
	}

}
addLoadEvent(initUpbox);